Pages w/o side bar (package beamer)

Hope this is not an FAQ.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=294912

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=294913

The submitter uses a theme, which is designed to have side bars (Berkeley). Now he wants to have a page w/o side bar and writes:

\begin{frame}[plain]
\begin{center}
lot of text to see the effect: lorem ipsum....
\end{center}
\end{frame}


He expects that the text is centered now, but this is not the case; the side bar is still regarded when placing the text. Same for images:

\begin{frame}[plain]
\resizebox{\textwidth}{!}{%
\includegraphics{image}
}
\end{frame}


Minimal example for testing can be provided.

Before opening a useless ticket @the beamer maintainers: FAD or bug? Of course it works fine when using a theme not having side bars (e.g. Madrid).

Many thanks! Hilmar

Not a perfect solution, but much closer than the default. Working from Removing sidebar from a single beamer frame:

\documentclass{beamer}

\usetheme{Berkeley}

\newenvironment{specialframe}
{
\begingroup
\hsize\textwidth
\columnwidth\textwidth
\begin{frame}[plain]
}
{
\end{frame}
\endgroup
}

\begin{document}

\begin{specialframe}
\begin{center}
This should be \textbf{really} centered horizontally!

Unfortunately it is only centered according to the display
area while the frame on the left side remains even if \texttt{$plain$}
was given as option to the frame environment.

The next frame is a try to cover the \textbf{whole} screen with an
image.
\end{center}
\end{specialframe}

\begin{specialframe}
\resizebox{\textwidth}{!}{%
\includegraphics{example-image-a}
}
\end{specialframe}

\begin{frame}
Here's a regular frame.
\end{frame}

\end{document}

• Many thanks! However I wasn't looking for a solution of the problem, but rather for an opinion if the observed behavior is a bug or not. If yes, I'd open a ticket @ the beamer tracking system. – Hilmar Preuße May 2 '14 at 11:31
• Only the maintainers can say if it's working as intended. But I'd agree it's odd to have a plain page with invisible asymmetric margins. – Mike Renfro May 2 '14 at 12:58